If I want to save any changes in a table, previously saved in SQL Server Management Studio (no data in table present) I get an error message:
Saving c
Go into Tools -> Options -> Designers-> Uncheck "Prevent saving changes that require table re-creation". Voila.
That happens because sometimes it is necessary to drop and recreate a table in order to change something. This can take a while, since all data must be copied to a temp table and then re-inserted in the new table. Since SQL Server by default doesn't trust you, you need to say "OK, I know what I'm doing, now let me do my work."
This is a risk to turning off this option. You can lose changes if you have change tracking turned on (your tables).
Chris
http://chrisbarba.wordpress.com/2009/04/15/sql-server-2008-cant-save-changes-to-tables/
Rather than unchecking the box (a poor solution), you should STOP editing data that way. If data must be changed, then do it with a script, so that you can easily port it to production and so that it is under source control. This also makes it easier to refresh testing changes after production has been pushed down to dev to enable developers to be working against fresher data.
Tools>Options
Uncheck above option
GO to SSMS and try this
Menu >> Tools >> Options >> Designers >> Uncheck “Prevent Saving changes that require table re-creation”.
Here is a very good explanation on this: http://blog.sqlauthority.com/2009/05/18/sql-server-fix-management-studio-error-saving-changes-in-not-permitted-the-changes-you-have-made-require-the-following-tables-to-be-dropped-and-re-created-you-have-either-made-changes-to-a-tab/
Many changes you can make very easily and visually in the table editor in SQL Server Management Studio actually require SSMS to drop the table in the background and re-create it from scratch. Even simple things like reordering the columns cannot be expressed in standard SQL DDL statement - all SSMS can do is drop and recreate the table.
This operation can be a) very time consuming on a large table, or b) might even fail for various reasons (like FK constraints and stuff). Therefore, SSMS in SQL Server 2008 introduced that new option the other answers have already identified.
It might seem counter-intuitive at first to prevent such changes - and it's certainly a nuisance on a dev server. But on a production server, this option and its default value of preventing such changes becomes a potential life-saver!